浅学之字符串连接符

public class Demo04 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        //字符串连接符  +
        System.out.println(""+a+b);//加号前面有字符串 则结果为字符串
        System.out.println(a+b+"");//加号后面有字符串 则结果正常运算
        
    }
}